Hollow stone ceiling



Nov. 7, 1933. w, MELLMANN 1,934,317

HOLLOW STONE CEILING Filed April 8, 1931 2 Sheets-Sheet 1 1933- wMELLMANN HQLLOW STONE CEILING Filed April 8, 1931 2 Sheets-Sheet 2Patented Nov. 7, 1933 UNITED STATES HOLLOW STONE CEILING Willy Mellmann,Lubcck, Germany Application April 8, 1931, Serial No. 528,658, and inGermany November 22, 1930 5 Claims.

Ceilings of previously manufactured reinforced concrete beams covered ontheir lower side with clay slabs, of hollow stones of burned claysuspended between these beams and of a concrete cover are known. In suchceilings there is however no groove near the lower side between twodirectly juxtaposed beams for the insertion of the main reinforcing bar,and there is further no possibility that the portions of the beamsprojecting from the clay slabs are enclosed on all sides by the concretecover.

In distinction hereof the invention is characterized in that the clayslabs of two directly juxtaposed beams form by means of their facingbevelled faces a very low situated groove, and that the portions of thebeams projecting from the clay slabs are exposed on all sides. Owing tothis arrangement the main reinforcing bar has the lowest possibleposition and the concrete cover encloses the concrete portion of thebeams on all sides.

Two embodiments of the invention are illustrated by way of example inthe accompanying drawings in which:

Fi l is a perspective view of a hollow stone ceiling.

Fig. 2 is a vertical cross section of Fig. 1.

Fig. 3 shows in perspective view a second form of construction.

Fig. 4 is a cross section of Fig. 3.

Supporting beams, hollow stones, reinforcing bars and concrete cover arerequired for building a ceiling. lhe previously manufactured supportingbeams consist of a clay slab a, which has a dove-tail-shapedlongitudinal groove, and of a concrete rib I) cast in the longitudinalgroove, and in which two reinforcing bars 0, c are embedded spaced bymeans of loops. The clay slabs a which cover the lower side of thereinforcing concrete beams 25 are bevelled on one of their longitudinalsides. Two beams b, b are placed the one directly at the side of theother so that the points of the bevelled sides join. In this manher agroove g is formed, in which the main reinforcing bar 1 is inserted sothat it is situated in the same horizontal plane as the two reinforcingbars 0, c of the beams b, b. The hollow stones e are suspended betweentwo pairs of beams, whereupon the concrete cover it is cast, which fillsthe groove g and covers on all sides the portion of the beams b, b,projecting from the clay slabs a.

In the form of construction shown in Figs. 3 and 4 the clay slab acovering the lower side of the reinforced concrete beams 12 is largerthan in the form of construction shown in Figs. 1 and 2 and has twoparallel longitudinal grooves k, 10 separated the one from the other bya longitudinal rib i. The previously manufactured reinforced concretebeam b with the reinforcing bars 0, 0 connected the one with the otherby loops is laid in the groove is of the clay slab 0, whereas, thehollow stones 6 having been suspended, the groove 1: serves for thelaying of the reinforcing bar 1. The covering concrete mass it fills thegroove k and encloses on all sides the portion of the beam 1) projectingfrom the clay slab a.

I claim:

1. A ceiling of previously manufactured reinforced concrete beams,covered on the lower side with clay slabs, of hollow stones of burnedclay suspended between said beams and of a concrete cover, in whichfacing longitudinal sides of the clay slabs of two directly juxtaposedbeams are bevelled so that a groove is formed for the main reinforcingbar, the concrete mass filling said groove and enclosing on all sidesthe portion of the beams projecting from said clay slabs.

2. A ceiling as specified in claim 1 wherein the clay slabs each have apair of deep longitudinal grooves, one groove being adapted to hold abeam and the other groove being adapted to hold a main reinforcing bar.

3. In a floor structure, a floor beam consisting of a clay slab having alongitudinal groove in its upper surface provided with undercut sidewalls, a preformed concrete member extending up from said slab andhaving its'lower part provided with a dovetail portion fitting in saidgroove to secure the slab to the concrete, and a reinforcing barextending longitudinally of the concrete in said groove.

4. In a floor structure, a floor beamconsisting of a clay slab having alongitudinal groove in its upper surface provided with undercut sidewalls, a preformed concrete member extending up from said slab andhaving its lower part provided with a dovetail portion fitting in saidgroove to secure the slab to the concrete, a reinforcing bar extendinglongitudinally of the concrete in said groove, said slab extendinglaterally of the concrete and shaped to provide space for a secondreinforcing bar, a second reinforcing bar associated with said laterallyextending portion of the slab, and a concrete filler mass enclosing the11;.

parallel to the first groove, a second reinforcing bar in said secondgroove, and a concrete filler mass filling the second groove around thebar therein and covering the concrete portion of the beam.

WILLY MELLMANN.

